The error message on the import batch is reporting an error that the combination of Account 123456 and dept 1 does not exist, when looking at the Edit Accounts grid. Indeed there is no 'Acct/Dept' import field - this is taking a combination of the Account and the Department field and morphing into a single message.

Do you have an account code 123456 and attached department code 1 when looking at Edit Accounts? If not then that is the reason for the error.

What changed recently? Did you install an Adagio Ledger upgrade or service pack? If so then what version were you running previously and what version are you running now?

What is the format of the file being imported? Excel? CSV? Another? How is the file created, and is it edited prior to importing?